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        "author": "Thomas Levine",
        "author_email": "_@thomaslevine.com",
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        "description": "Blargparse extends ``argparse.ArgumentParser``,\nadding an ``add_aggregate`` method that can help you separate\nyour user interface logic from everything else.\n\nHow to use\n-----------\n\nInstall from PyPI. ::\n\n    pip install blargparse\n\nHere's the simplest way to use it. ::\n\n    b = BlargParser()\n    b.add_argument('--left', '-l', type = int, default = 0)\n    b.add_argument('--right', 'r', type = int, default = 100)\n    b.add_aggregate('numbers', lambda args: range(args.left, args.right))\n\n    b.parse_args([]).numbers == range(0, 100)\n\nYou can get a bit fancier. ::\n\n    b = BlargParser()\n    b.add_argument('--left', '-l', type = int, default = 0)\n    b.add_argument('--right', 'r', type = int, default = 100)\n    def f(args):\n        output = range(args.left, args.right)\n        del(args.left, args.right)\n    b.add_aggregate(f)\n\n    b.parse_args([]).numbers == range(0, 100)\n\nWhy\n--------\nI wrote Blargparse because I found myself doing stuff like this. ::\n\n    # Construct the parser.\n    a = argparse.ArgumentParser()\n    a.add_argument('--left', '-l', type = int, default = 0)\n    a.add_argument('--right', 'r', type = int, default = 100)\n    \n    # Parse the arguments\n    import sys\n    ns = a.parse_args(sys.argv)\n\n    # Convert them into the form I want for my application.\n    numbers = range(ns.left, ns.right)\n\nThe input argument that made most sense to me while programming the\nthing was the ``numbers`` range, but I thought it was easiest if the\nend user could specify this range as a combination of ``--left`` and\n``--right`` flags. And I might want to change that based on what\nusers seem to prefer.\n\nThe above approach is fine because it's small, but I had several\narguments like this spread across several subparsers in different places,\nand the construction, parsing, and conversion of the arguments thus\nwound up spread across functions and even files.\n\nWith vanilla ``argparse`` I wound up doing stuff like this. ::\n\n    def _build_subparsers(argparser):\n        'This adds subparsers to the parser.'\n        subparsers = argparser.add_subparsers()\n        # ...\n\n    def _apply_aggregates(args):\n        args.range = range(args.left, args.right)\n        del(args.left, args.right)\n\n    argparser = argparser.ArgumentParser()\n    _build_subparsers(argparser)\n    args = argparser.parse_args()\n    _apply_aggregates(args)\n\nThis is a bit better except that it groups subparsers together and\naggregates together. I wanted subparsers to be grouped with relevant\naggregates, and I did not want to group by whether something was a\nsubparser or an aggregate; I think of the aggregates as components of\nthe subparsers.\n\nA more confusing alternative would have been to come up with my own\nnon-argparse interface on top of this for specifying groupings of\nsubparsers and aggregates.\n",
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